| 摘要 |
A keypad security device (100) comprises an enclosure having a viewing aperture (114) and an access aperture (152). The enclosure at least partially surrounds a keypad such that the keypad is viewable through the viewing aperture (114) and accessible by a user through the access aperture (152). The viewing aperture includes a security pane (116) arranged so as to permit the keypad to be viewed clearly from the point of view of a user of the keypad and to prevent the keypad from being viewed from the point of view of a person other than the user, wherein the security pane (116) is curved and comprises a flexible refractive lens. |
